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Wayback Machine the Military Map Reading 201 link |
m To clarify distinction between GZD / 100km-grid-square-id in examples, spaces have been added |
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An MGRS grid reference is a point reference system. When the term 'grid square' is used, it can refer to a square with a side length of {{convert|10|km|mi|0|abbr=on}}, 1 km, {{convert|100|m|ft|0|abbr=on}}, 10 m or 1 m, depending on the precision of the coordinates provided. (In some cases, squares adjacent to a Grid Zone Junction (GZJ) are clipped, so polygon is a better descriptor of these areas.) The number of digits in the numerical ___location must be even: 0, 2, 4, 6, 8 or 10, depending on the desired precision. When changing precision levels, it is important to [[truncate]] rather than [[rounding|round]] the easting and northing values to ensure the more precise polygon will remain within the boundaries of the less precise polygon. Related to this is the primacy of the southwest corner of the polygon being the labeling point for an entire polygon. In instances where the polygon is not a square and has been clipped by a grid zone junction, the polygon keeps the label of the southwest corner as if it had not been clipped.
* 4Q ......................GZD only, precision level 6° × 8° (in most cases)
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==Grid zone designation==
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